Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40e61087112c28e…

MALICIOUS

PDF

64.5 KB Created: 2020-08-03 01:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 867bfc98a78ffb63a535d0109b30359e SHA-1: be5c68b879a401fc82afd5cfd3740fe5ecfdaa05 SHA-256: d40e61087112c28efc5eb40597113808d8c00bcd6d4fcb273d965baf2bf8bdde
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to its extensive use of external links, a technique often employed for SEO manipulation or to redirect users to malicious infrastructure. One critical heuristic flagged a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=nordvpn+is+horrible%255C'. Another heuristic identified a large 'link farm' within the PDF, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0433/6805/4949/files/king_worm_adventure_time.pdf'. The document body appears to be malformed or heavily obfuscated, preventing a deeper analysis of its specific content or intent beyond the link-based heuristics.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=nordvpn+is+horrible%255C
    • http://files.kitgymnastics.com/uploads/1/3/2/6/132682822/ledijelolamonuf-guwajip.pdf
    • http://files.nourishingacres.com/uploads/1/3/1/1/131164273/1063806.pdf
    • http://files.daniellemerceryoga.com/uploads/1/3/1/1/131163834/1152948.pdf
    • http://files.kwokwahtyre.com/uploads/1/3/1/3/131379948/8b234107.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/king_worm_adventure_time.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/php_image_opacity.pdf
    • https://cdn.shopify.com/s/files/1/0440/1790/9910/files/university_physics_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/blue_snowball_settings.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/moves.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6024/files/damilirajawaluzexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/4845353253.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6580/files/75925201653.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/juponuvidikemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/kajama.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/52372795431.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/54811910508.pdf
    • https://cdn.shopify.com/s/files/1/0437/9344/9122/files/nabokavi.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d8.bin
637fa1941dd2a4321824f8b6737f0d2fe00d091d6113941d7e5d82de3e59781d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 5040 bytes
font_01_sfnt_off0000d907.bin
3de30e09afd7fb125e47f3375e9beef5dd37fc7b000fc2d8d6d4347f1326081b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 10868 bytes

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